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Amy Butte, who resigned abruptly from the New York Stock Exchange in February, has joined broker Man Financial as global chief financial officer.

Butte will take up her post in New York in September and will report directly to Kevin Davis, Man Financial’s chairman and chief executive.

Davis said: “In the past few years our business has undergone rapid expansion while becoming increasingly complex. We believe having Amy on board will greatly help us strategically manage the further growth we expect in the years ahead, both within the US and abroad.”

Butte said: "This is a very exciting opportunity. Man Financial has a leading global position in listed and unlisted derivatives, the fastest growing portion of the financial services industry."

Butte resigned abruptly as chief financial officer of the New York Stock Exchange in mid-February, just days before the exchange was expected to complete its merger with Archipelago, an electronic share-trading firm.

Her resignation surprised the market, as she had given no public sign that she did not intend to stay. It was understood Butte was not satisfied with her new job as executive vice-president in charge of strategy, a role she was expected to take on once the merger was complete.

Butte had worked at Credit Suisse as chief strategist and chief financial officer reporting directly to Jeff Peek, then head of the bank's financial services division. This followed a career as an equity research analyst at Bear Stearns.

Man Financial has offices in 11 countries and more than 3,000 employees. Last year the firm acquired part of Refco, a broker that went into bankruptcy last year.